EP 0303375 B1 19931006 - CHEMICALLY DURABLE, HIGH INDEX, LOW DENSITY GLASSES
Title (en)
CHEMICALLY DURABLE, HIGH INDEX, LOW DENSITY GLASSES
Publication
Application
Priority
- FR 8711586 A 19870814
- US 19083988 A 19880506
Abstract (en)
[origin: EP0303375A1] This invention is directed to the production of glasses especially suitable for use as ophthalmic lenses which exhibit indices of refraction between about 1.699-1.703, Abbe numbers equal to or greater than 41.0, densities less than 3.25 g/cm<3>, and good resistance to attack by acids. The glasses are essentially free of Al2O3 and consist essentially, in weight percent on the oxide basis, of: <TABLE> t
IPC 1-7
IPC 8 full level
C03C 3/064 (2006.01); C03C 3/068 (2006.01); C03C 4/20 (2006.01)
CPC (source: EP)
C03C 3/068 (2013.01)
Designated contracting state (EPC)
DE ES GB IT NL
DOCDB simple family (publication)
EP 0303375 A1 19890215; EP 0303375 B1 19931006; AU 2040688 A 19890216; AU 603474 B2 19901115; BR 8804084 A 19890307; DE 3884715 D1 19931111; DE 3884715 T2 19940421; ES 2043829 T3 19940101; IL 87325 A0 19890131; IL 87325 A 19940624; JP 2686777 B2 19971208; JP H01157430 A 19890620
DOCDB simple family (application)
EP 88307010 A 19880729; AU 2040688 A 19880804; BR 8804084 A 19880812; DE 3884715 T 19880729; ES 88307010 T 19880729; IL 8732588 A 19880803; JP 20181588 A 19880812